3х²-2х-1 = 0
а = 3, b = -2, c = -1
D = b²-4ac = (-2)²-4×3×(-1) = 4+12 = 16
Первый x = (-b-√D)/2a = (2-4)/6 = -2/6 = -1/3
Второй х = (-b+√D)/2a = (2+4)/6 = 1
Сумма корней = -1/3+1 = 2/3
Произведение корней = -1/3×1 = -1/3
3х²-2х-1 = 0
а = 3, b = -2, c = -1
D = b²-4ac = (-2)²-4×3×(-1) = 4+12 = 16
Первый x = (-b-√D)/2a = (2-4)/6 = -2/6 = -1/3
Второй х = (-b+√D)/2a = (2+4)/6 = 1
Сумма корней = -1/3+1 = 2/3
Произведение корней = -1/3×1 = -1/3